Build Your Own Arcade Controls Forum
Main => Audio/Jukebox/MP3 Forum => Topic started by: dhansen on November 16, 2003, 03:02:03 am
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Hello,
Wasn't there a separate audio forum earlier today? When did these get combined?
Anyway, I have hacked a amplifier out of an old set of PC speakers and I was wondering if I could power this off the 5v of my switching power supply. The amp origianaly took a 6V power supply, but I was wondering if the 1V would make any difference.
Thanks!
Doug
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Yes, you can do this since it is only an amplification circuit. About the worse that can happen is the amp will be a little quieter, but probably not enough to notice.
In a similar vein, Williams sound boards require +12V & -12V from the power supply for the amp (24V), but if you use a newer arcade switching power supply, you only have +12, +5, and -5V per the jamma standard. In this case, I wire the -5V to the -12V input to the sound board, and it still works fine. It just won't as loud as it would with -12V.
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I just can't leave well enough alone :)
Hello,
Wasn't there a separate audio forum earlier today? When did these get combined?
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I just can't leave well enough alone :)
Hello,
Wasn't there a separate audio forum earlier today? When did these get combined?
Ahhhh, I thought I was going nucking futz! Thanks Oscar, I should have listened during the electronics chapter in science. :-[
Doug
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Hmmm this didn't work too well. I hooked up the power to ground and +5v 1A on the switching power supply and the red light on the amp lit up but it dimmed when I plugged the audio jack into the PC. What would cause this? Anyway, I just ended up using the transformer that came with it.
My power strip is wired to 4 plugs are on a switch and two are constant power so all the lights, sound, and monitor come on with one switch. The PC's bios is set so I can power it up from the control panel with a couple clicks of a button.
Doug
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I just can't leave well enough alone :)
Hello,
Wasn't there a separate audio forum earlier today? When did these get combined?
Good Grief Carlie Saint! ;)
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Hi,
I have a similar situation except I need to go from 12 volts to 9 volts to power my audio amp. The amp requires 9 volts .7 amps. I've tried feeding it 5 and 12 volts from my powersupply but it didn't like that much. Originally, I was using the ac adapter but it created a magnetic field causing my monitor to swim unless the refresh rate was exactly 60hz to coincide with the frequency of ac power.
I guess I'll have to order a voltage regulator like a LM2940T-9.0 from digi-key. It's $6 dollars for one but shipping will be $12, so I'll have to pad my order with some other stuff.
Macros
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You can probably get a replacement 6V adapter at Radio Shack, or an electronic supply store.
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Hi,
I have a similar situation except I need to go from 12 volts to 9 volts to power my audio amp. The amp requires 9 volts .7 amps. I've tried feeding it 5 and 12 volts from my powersupply but it didn't like that much. Originally, I was using the ac adapter but it created a magnetic field causing my monitor to swim unless the refresh rate was exactly 60hz to coincide with the frequency of ac power.
I guess I'll have to order a voltage regulator like a LM2940T-9.0 from digi-key. It's $6 dollars for one but shipping will be $12, so I'll have to pad my order with some other stuff.
Macros
It might be worth trying it on 7 volts. The 7 volt trick was initially used by modders who wanted to quieten their fans, simple instructions on how to do this can be found here: http://www.cpemma.co.uk/7volt.html
I don't know if it'll work for you (due to me being too dumb to work out the current you'd get), but it might be worth a try before you go off and buy some stuff you might not need ;)
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I knew about the 7 volt trick but I was a little apprehensive about using it with the speaker amp's circuit. It's fine for something simple like power to a fan. I ended up buying parts locally to make up a circuit using a 7809 fixed voltage regulator. I bought enough parts to make 5 of these for less than $12.
It's a pretty simple thing to do, here is a schematic.
(http://members.rogers.com/sschwartz2000/images/9volt.jpg)